Jj. Li et al., MEASUREMENT OF LARGE INFINITE DILUTION ACTIVITY-COEFFICIENTS OF NONELECTROLYTES IN WATER BY INERT-GAS STRIPPING AND GAS-CHROMATOGRAPHY, Analytical chemistry, 65(22), 1993, pp. 3212-3218
An inert gas stripping gas chromatography method was described for the
determination of infinite dilution activity coefficients (gamma2infin
ity) of organic compounds in water. The infinite dilution activity coe
fficients for 31 compounds including many halogenated and aromatic com
pounds were measured. In general, the gamma2infinity values measured b
y gas stripping are in very good agreement with gamma2infinity values
estimated from the inverse solubilities and other experimental measure
ments. This suggests that when there is no directly measured data avai
lable, gamma2infinity values estimated from the inverse of solubility
can be used for the development and test of the models predicting limi
ting activity coefficients. A major advantage of this method relative
to headspace gas chromatography that improves its precision and accura
cy is the fact that the absolute detector response is unimportant. The
detector only needs to be linear.